I am working on a 1967 109 staton wagon. It has the stock 2.25 engine. It was running great then out of nowhere it started running only on #1 & 2. If I remove the plug wires on 3&4 cylinders it doesn't make any difference. I have tried almost everything I can think of to make it run on all 4. The head is rebuilt...new valves,guides,seals,& exhaust seats. Honed the cylinders & installed new rings. Adjusted the valves like the book says. I have compression & spark. I have two distributors...the original Lucas with a pertronics & a new one with points(this is the one that was in the engine when it started running bad). Nothing changes with either one. I static timed it like the book says, TDS on flywheel both valves closed dissy rotor pointing to #1 BUT when I put my adjustable timing light on it I have to move the knob on the timing light 40 degrees to see the timing marks????
Could the gear between the cam & dissy jump a tooth? Also what is the grub screw & what does it do?
I just about out of ideas.